Data Release 2 of S-PLUS: Accurate template-fitting based photometry covering ∼1000 deg2 in 12 optical filters

• Published in: Monthly notices of the Royal Astronomical Society Vol. 511; no. 3; pp. 4590 - 4618
• Main Authors: Almeida-Fernandes, F, SamPedro, L, Herpich, F R, Molino, A, Barbosa, C E, Buzzo, M L, Overzier, R A, de Lima, E V R, Nakazono, L M I, Oliveira Schwarz, G B, Perottoni, H D, Bolutavicius, G F, Gutiérrez-Soto, L A, Santos-Silva, T, Vitorelli, A Z, Werle, A, Whitten, D D, Costa Duarte, M V, Bom, C R, Coelho, P, Sodré, L, Placco, V M, Teixeira, G S M, Alonso-García, J, Barbosa, C L, Beers, T C, Bonatto, C J, Chies-Santos, A L, Hartmann, E A, Lopes de Oliveira, R, Navarete, F, Kanaan, A, Ribeiro, T, Schoenell, W, Mendes de Oliveira, C
• Format: Journal Article
• Language: English
• Published: 26-02-2022
• ISSN: 0035-8711; 1365-2966
• DOI: 10.1093/mnras/stac284

ABSTRACT
The Southern Photometric Local Universe Survey (S-PLUS) is an ongoing survey of ∼9300 deg2 in the southern sky in a 12-band photometric system. This paper presents the second data release (DR2) of S-PLUS, consisting of 514 tiles covering an area of 950 deg2. The data has been fully calibrated using a new photometric calibration technique suitable for the new generation of wide-field multifilter surveys. This technique consists of a χ2 minimization to fit synthetic stellar templates to already calibrated data from other surveys, eliminating the need for standard stars and reducing the survey duration by ∼15 per cent. We compare the template-predicted and S-PLUS instrumental magnitudes to derive the photometric zero-points (ZPs). We show that these ZPs can be further refined by fitting the stellar templates to the 12 S-PLUS magnitudes, which better constrain the models by adding the narrow-band information. We use the STRIPE82 region to estimate ZP errors, which are ≲ 10 mmags for filters J0410, J0430, g, J0515, r, J0660, i, J0861 and z; ≲ 15 mmags for filter J0378; and ≲ 25 mmags for filters u and J0395. We describe the complete data flow of the S-PLUS/DR2 from observations to the final catalogues and present a brief characterization of the data. We show that, for a minimum signal-to-noise threshold of 5, the photometric depths of the DR2 range from 19.1 to 20.5 mag (measured in Petrosian apertures), depending on the filter. The S-PLUS DR2 can be accessed from the website: https://splus.cloud.